| 摘要 |
An impeller of a centrifugal fan, the impeller used in the centrifugal fan having a casing and the impeller rotatably mounted in the casing. The impeller includes a hub connecting a number of blades equiangularly disposed in a circumferential direction. The hub includes an outer circular hub partially covering an outer peripheral edge of the blade, and an inner circular hub partially covering an inner peripheral edge of the blade. The hubs are concentrically formed, and an opening is provided between the inner and outer circular hubs. The inner circular hub, outer circular hub and opening are arranged to allow air to flow back across the inner circular hub and within the casing to cool a control circuit disposed within the casing.
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